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diff --git a/libstdc++-v3/config/cpu/sparc/atomicity.h b/libstdc++-v3/config/cpu/sparc/atomicity.h
new file mode 100644
index 00000000..be3b07f3
--- /dev/null
+++ b/libstdc++-v3/config/cpu/sparc/atomicity.h
@@ -0,0 +1,122 @@
+// Low-level functions for atomic operations: Sparc version  -*- C++ -*-
+
+// Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005, 2009
+// Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+#include <ext/atomicity.h>
+
+_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
+
+#ifdef __arch64__
+  _Atomic_word
+  __attribute__ ((__unused__))
+  __exchange_and_add(volatile _Atomic_word* __mem, int __val)
+  {
+    _Atomic_word __tmp1, __tmp2;
+    _Atomic_word __val_extended = __val;
+
+    __asm__ __volatile__("1:	ldx	[%3], %0\n\t"
+			 "	add	%0, %4, %1\n\t"
+			 "	casx	[%3], %0, %1\n\t"
+			 "	sub	%0, %1, %0\n\t"
+			 "	brnz,pn	%0, 1b\n\t"
+			 "	 nop"
+			 : "=&r" (__tmp1), "=&r" (__tmp2), "=m" (*__mem)
+			 : "r" (__mem), "r" (__val_extended), "m" (*__mem));
+    return __tmp2;
+  }
+  
+  void
+  __attribute__ ((__unused__))
+  __atomic_add(volatile _Atomic_word* __mem, int __val)
+  {
+    _Atomic_word __tmp1, __tmp2;
+    _Atomic_word __val_extended = __val;
+    
+    __asm__ __volatile__("1:	ldx	[%3], %0\n\t"
+			 "	add	%0, %4, %1\n\t"
+			 "	casx	[%3], %0, %1\n\t"
+			 "	sub	%0, %1, %0\n\t"
+			 "	brnz,pn	%0, 1b\n\t"
+			 "	 nop"
+			 : "=&r" (__tmp1), "=&r" (__tmp2), "=m" (*__mem)
+			 : "r" (__mem), "r" (__val_extended), "m" (*__mem));
+  }
+  
+#else /* __arch32__ */
+
+  template<int __inst>
+    struct _Atomicity_lock
+    {
+      static unsigned char _S_atomicity_lock;
+    };
+
+  template<int __inst>
+  unsigned char _Atomicity_lock<__inst>::_S_atomicity_lock = 0;
+  
+  template unsigned char _Atomicity_lock<0>::_S_atomicity_lock;
+  
+  _Atomic_word
+  __attribute__ ((__unused__))
+  __exchange_and_add(volatile _Atomic_word* __mem, int __val)
+  {
+    _Atomic_word __result, __tmp;
+    
+    __asm__ __volatile__("1:	ldstub	[%1], %0\n\t"
+			 "	cmp	%0, 0\n\t"
+			 "	bne	1b\n\t"
+			 "	 nop"
+			 : "=&r" (__tmp)
+			 : "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
+			 : "memory");
+    __result = *__mem;
+    *__mem += __val;
+    __asm__ __volatile__("stb	%%g0, [%0]"
+			 : /* no outputs */
+			 : "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
+			 : "memory");
+    return __result;
+  }
+  
+  void
+  __attribute__ ((__unused__))
+  __atomic_add(volatile _Atomic_word* __mem, int __val)
+  {
+    _Atomic_word __tmp;
+    
+    __asm__ __volatile__("1:	ldstub	[%1], %0\n\t"
+			 "	cmp	%0, 0\n\t"
+			 "	bne	1b\n\t"
+			 "	 nop"
+			 : "=&r" (__tmp)
+			 : "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
+			 : "memory");
+    *__mem += __val;
+    __asm__ __volatile__("stb	%%g0, [%0]"
+			 : /* no outputs */
+			 : "r" (&_Atomicity_lock<0>::_S_atomicity_lock)
+			 : "memory");
+  }  
+#endif /* __arch32__ */
+
+_GLIBCXX_END_NAMESPACE